I read another very interesting book-- it was by Leonard Sax-- Boys adrift : the five factors driving the growing epidemic of unmotivated boys and underachieving young men.

These are the five factors he listed:
The first factor : changes at school --
The second factor : video games --
The third factor : medications for ADHD --
The fourth factor : endocrine disruptors --
The fifth factor : the revenge of the forsaken gods

He claims the research shows that ADHD meds may make for more docile boys, but permanently drain young men of ambition. (I don't know if it's true!)

He also claimed that video games permanently alter the makeup of kids' brains.

Endocrine disruptors are environmental estrogens-- plastics, etc.-- which disrupt the development of both sexes--make girls develop early and boys not at all.

The fifth factor, what he calls "revenge of the forsake gods" had I think to do with the Neitzchian (sp?) concept of the will to power, which grips boys in a way that it does not grip girls.